Recently, the Centers for Disease Control (CDC) released an early report underlining the discovery of a commonality in the deaths caused by vaping-related illnesses. Lung samples taken from 29 patients found that every sample contained vitamin E acetate.
While vitamin E acetate is found most commonly in THC-containing products, it is not exclusively in THC products. THC is the agent in marijuana that causes a high. The CDC report states that vitamin E acetate "might be used as an additive in the production of e-cigarette, or vaping products; it also can be used as a thickening agent in THC products."
The CDC cautioned that more work still needs to be done to definitively prove that vitamin E acetate is the cause of vaping related deaths.